scholarly journals CHIRAL CONDENSATE IN NUCLEAR MATTER WITH VACUUM CORRECTIONS

2008 ◽  
Vol 23 (40) ◽  
pp. 3393-3403 ◽  
Author(s):  
WEI-ZHOU JIANG ◽  
BAO-AN LI
Keyword(s):  
Equation Of State ◽  
Nuclear Matter ◽  
Chiral Symmetry ◽  
Scaling Law ◽  
Chiral Condensate ◽  
Chiral Symmetry Restoration ◽  
Density Dependent ◽  
Dirac Sea

Within the relativistic Hartree approach using a Lagrangian with density-dependent parameters according to the Brown–Rho scaling law, it is found that the vacuum corrections from the nucleon Dirac sea soften the equation of state and favor the chiral symmetry restoration at high densities.

Chiral symmetry restoration of nuclear matter

2002 ◽  
Vol 28 (8) ◽  
pp. 2265-2273 ◽  
Author(s):  
P Wang ◽  
H Guo ◽  
Y B Dong ◽  
Z Y Zhang ◽  
Y W Yu
Keyword(s):  
Nuclear Matter ◽  
Chiral Symmetry ◽  
Chiral Symmetry Restoration

ISOVECTOR COMPONENTS OF THE SCALAR σ-MESON FAMILY AS NEW INGREDIENTS FOR NUCLEAR MATTER MODELS

2007 ◽  
Vol 16 (02n03) ◽  
pp. 325-332 ◽  
Author(s):  
EDUARDO LÜTZ ◽  
MOISÉS RAZEIRA ◽  
CÉSAR A. Z. VASCONCELLOS ◽  
BARDO E. J. BODMANN ◽  
FERNANDO PILOTTO
Keyword(s):  
Equation Of State ◽  
Neutron Stars ◽  
Nuclear Matter ◽  
Chiral Symmetry ◽  
Symmetry Transformation ◽  
Recent Analysis ◽  
Scalar Mesons ◽  
The Family ◽  
Macroscopic Properties ◽  
Light Scalar

On the basis of a chiral symmetry transformation, we predict an isovector component for the family of light scalar mesons, i.e. partners of the σ-meson. Such a contribution may be necessary to tune the equation of state of nuclear matter in order to comply with severe constraints from a recent analysis of observational macroscopic properties of neutron stars.

scholarly journals MONOPOLES FROM QUARK CONDENSATES IN QCD

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2356-2359
Author(s):  
M. N. CHERNODUB
Keyword(s):  
Chiral Symmetry ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Chiral Condensate ◽  
Quark Condensate ◽  
Chiral Symmetry Restoration ◽  
Gauge Invariant ◽  
Different Temperatures

Chiral monopoles are hedgehoglike structures in local chiral condensates in QCD. These monopoles are (i) made of quark and gluon fields; (ii) explicitly gauge-invariant; (iii) they carry quantized and conserved chromomagnetic charge. We argue that the chiral condensate vanishes in a core of the chiral monopole while the density of these monopoles increases with temperature wiping out the quark condensate in quark-gluon plasma. We suggest that the chiral monopoles are responsible for the chiral symmetry restoration in QCD. We also argue that the chiral monopoles are unlikely to be responsible for confinement of color. Thus, phenomena of the chiral symmetry restoration and the color deconfinement in QCD are not necessarily related to each other and the corresponding transitions may happen at different temperatures.

scholarly journals NUCLEON SIGMA TERM AND IN-MEDIUM QUARK CONDENSATE IN THE MODIFIED Quark–MESON COUPLING MODEL

1999 ◽  
Vol 14 (04) ◽  
pp. 289-297 ◽  
Author(s):  
XUEMIN JIN ◽  
MANUEL MALHEIRO
Keyword(s):  
Chiral Symmetry ◽  
Linear Order ◽  
Coupling Model ◽  
Quark Condensate ◽  
Chiral Symmetry Restoration ◽  
Density Dependent ◽  
Sigma Term ◽  
Meson Coupling ◽  
Model Independent ◽  
Bag Constant

We evaluate the nucleon sigma term and in-medium quark condensate in the modified quark–meson coupling model which features a density-dependent bag constant. We obtain a nucleon sigma term consistent with its empirical value, which requires a significant reduction of the bag constant in the nuclear medium similar to those found in the previous works. The resulting in-medium quark condensate at low densities agrees well with the model-independent linear order result. At higher densities, the magnitude of the in-medium quark condensate tends to increase, indicating no tendency towards chiral symmetry restoration.

scholarly journals Deconfinement in QCD with Dynamical Quarks

1997 ◽  
Vol 12 (13) ◽  
pp. 949-961 ◽  
Author(s):  
O. Borisenko ◽  
M. Faber ◽  
G. Zinovjev
Keyword(s):  
Phase Transition ◽  
Chiral Symmetry ◽  
Canonical Ensemble ◽  
Three Dimensional ◽  
Chiral Condensate ◽  
Chiral Symmetry Restoration ◽  
Coupling Region ◽  
Effective Potentials ◽  
Deconfinement Phase Transition ◽  
Grand Canonical

We study the phase structure of full QCD within the canonical ensemble (CE) with respect to triality in a lattice formulation. The procedure to calculate the effective potentials (EP) in the CE is given. We calculate the EP for the three-dimensional SU(2) gauge model at finite temperature in the strong coupling region. The potential exhibits a genuine deconfinement phase transition unlike the similar potential obtained in the grand canonical ensemble (GCE). Furthermore, we investigate the EP with the chiral condensate included. Contrary to other recent results we find chiral symmetry restoration in all triality sectors. Dealing with massless staggered fermions we observe chiral symmetry restoration accompanying a deconfinement phase transition of first-order. Above the critical point, besides two Z(2) symmetric "deconfining" vacua there exists a metastable "confining" vacuum in a wide region of the (Nt,γ)-plane. Such a picture could be interpreted as an indication for a mixed state of hadrons and quarks in the vicinity of the critical line.

NUCLEAR MATTER PROPERTIES USING DIFFERENT SETS OF PARAMETERS IN THE GOGNY INTERACTION

2002 ◽  
Vol 11 (02) ◽  
pp. 143-154
Author(s):  
Kh. A. RAMADAN ◽  
H. M. M. MANSOUR
Keyword(s):  
Equation Of State ◽  
Nuclear Matter ◽  
The Other ◽  
Interaction Parameters ◽  
Finite Range ◽  
Density Dependent ◽  
Realistic Interaction ◽  
Range Density

In the present work we use the finite range density dependent effective Gogny interaction to study the equation of state of polarized nuclear matter. Six sets of the interaction parameters are used and a comparison is made with the calculations of Friedman and Pandharipande using a realistic interaction. One of the parameter sets (D1) gives similar results for the properties of polarized nuclear matter while the other parameter sets (D1S, D250, D260, D280 and D300) yield results which are reasonably comparable with the realistic interaction calculation of Friedman and Pandharipande

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